SymProjects Forum

General Category => General Discussions => Topic started by: Mortos on August 15, 2011, 11:47:13 pm

Title: GI Max decimal point with Pro Shift
Post by: Mortos on August 15, 2011, 11:47:13 pm

Cristiano, here (http://www.symprojects.com/forum/index.php?topic=58.0), you implied the GI Max doesn't have its decimal point connected to the microcontroller.

As both the GI Max display and Pro Shift are common cathode it should be possible to connect them, I'm hoping it's fairly straightforward. The way I see it is as follows:

Solder an output wire of the Pro Shift to pin 8 on the display(the datasheet I found states the upper middle pin is 8/Decimal Point, is this correct?), connect the cathodes of both Pro Shift and GI Max together, done.

If both devices use the same USB bus, is is still necessary to connect the cathodes together? If so, where can I solder onto the GI Max?

Title: Re: GI Max decimal point with Pro Shift
Post by: Cristiano on August 16, 2011, 02:12:19 pm

Hello.
it won't work because the 7 segments display of the GI Max is common cathode, so you should connect a positive voltage to the decimal point pin to switch it on.

The pro shift instead drives the low voltage lead of the LEDs. I mean the positive lead is always connect to the 5V. the other pin goes to ground when the led is switch on. it goes to 5V to switch the led off.

Regards
Cristiano